/**
* Copyright 2011 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.neo4j.support.path;
import org.junit.Test;
import org.neo4j.graphdb.Path;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.mockito.Mockito.mock;
/**
* @author mh
* @since 22.02.11
*/
public class PathMappingIteratorTest {
private static final int PATHS_COUNT = 3;
@Test
public void lazyIteratorShouldNotCallBackBeforeUse() {
runAndCheckMode(0, PATHS_COUNT, IterationController.IterationMode.LAZY);
}
@Test
public void eagerIteratorShouldBeCalledImmediately() {
runAndCheckMode(PATHS_COUNT, PATHS_COUNT, IterationController.IterationMode.EAGER);
}
@Test
public void eagerStopOnNullIteratorShouldBeCalledImmediatelyAndReturnReducedResult() {
runAndCheckMode(2, 2, IterationController.IterationMode.EAGER_STOP_ON_NULL);
}
@Test
public void eagerStopIgnoresResultIteratorShouldBeCalledImmediatelyAndReturnNoResult() {
Iterable<Integer> result = runAndCheckMode(PATHS_COUNT, PATHS_COUNT, IterationController.IterationMode.EAGER_IGNORE_RESULTS);
assertNull("no result",result);
}
@Test
public void defaultPathMapperIsLazy() {
final AtomicInteger counter=new AtomicInteger();
PathMapper<Integer> pathMapper = new PathMapper<Integer>() {
@Override
public Integer mapPath(Path path) {
return counter.incrementAndGet();
}
};
Iterable<Integer> result = new PathMappingIterator().mapPaths(paths(), pathMapper);
assertEquals(0, counter.get());
for (Integer integer : result) ;
assertEquals(PATHS_COUNT, counter.get());
}
@Test
public void defaultPathCallbackIsEagerAndIgnoresResult() {
final AtomicInteger counter=new AtomicInteger();
PathMapper.WithoutResult pathMapper = new PathMapper.WithoutResult() {
@Override
public void eachPath(Path path) {
counter.incrementAndGet();
}
};
Iterable<Void> result = new PathMappingIterator().mapPaths(paths(), pathMapper);
assertEquals(PATHS_COUNT, counter.get());
assertNull("no result",result);
assertEquals(PATHS_COUNT, counter.get());
}
private List<Path> paths() {
Path anyPath = mock(Path.class);
Path[] paths=new Path[3];
Arrays.fill(paths,anyPath);
return Arrays.asList(paths);
}
private Iterable<Integer> runAndCheckMode(int countAfterMap, int countAfterIteration, IterationController.IterationMode iterationMode) {
TestPathMapper pathMapper = new TestPathMapper(iterationMode);
Iterable<Integer> result = new PathMappingIterator().mapPaths(paths(), pathMapper);
assertEquals(countAfterMap, pathMapper.counter);
if (result!=null) for (Integer integer : result) ;
assertEquals(countAfterIteration, pathMapper.counter);
return result;
}
private static class TestPathMapper implements PathMapper<Integer>, IterationController {
public int counter;
private IterationMode iterationMode;
public TestPathMapper(IterationMode iterationMode) {
this.iterationMode = iterationMode;
}
@Override
public Integer mapPath(Path path) {
counter++;
if (counter == 2) return null;
return counter;
}
@Override
public IterationMode getIterationMode() {
return iterationMode;
}
}
}